A force of 30 pounds is applied 2 feet from a pivot. How much torque does it produce?

Correct answer to question 49 (Mechanical Comprehension): 60 pound-feet

Method

Torque is force times the perpendicular distance from the pivot, so 30 x 2 = 60 pound-feet. Doubling the length of the wrench doubles the torque for the same pull, which is why a breaker bar works.